Android KitKat 4.4 Chromium WebView“v8_value_converter_impl.cc”错误

Question

我正在构建一个包含几个 webview 的 Android 应用程序。该应用程序需要至少支持 KitKat 4.4，根据this 嵌入 chromium v​​30 webview。我正在运行 4.4.2 stock rom 的 Samsung Galaxy Note 2 上测试该应用程序，webview 运行速度非常慢，并且 logcat 充斥着以下错误消息：

...
03-21 14:11:48.651 29445-29445/com.mylovely.app I/GraphicBuffer: allocate buffer (w:384 h:384 f:1) handle(0x6f64b600) err(0)
03-21 14:11:48.652 29445-29445/com.mylovely.app I/GraphicBuffer: allocate buffer (w:384 h:384 f:1) handle(0x6d715280) err(0)
03-21 14:11:48.652 29445-29445/com.mylovely.app I/GraphicBuffer: allocate buffer (w:128 h:192 f:1) handle(0x6dd99590) err(0)
03-21 14:12:03.996 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionDirection threw an exception.
03-21 14:12:03.996 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionEnd threw an exception.
03-21 14:12:03.996 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionStart threw an exception.
03-21 14:12:04.007 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionDirection threw an exception.
03-21 14:12:04.007 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionEnd threw an exception.
03-21 14:12:04.007 29445-29884/com.mylovely.app E/chromium: [ERROR:v8_value_converter_impl.cc(405)] Getter for property selectionStart threw an exception.
... <skipped lots of duplicated error here>

03-21 14:12:05.370 29445-29445/com.mylovely.app I/dalvikvm-heap: Grow heap (frag case) to 41.055MB for 11211498-byte allocation
03-21 14:12:06.285 29445-29445/com.mylovely.app I/dalvikvm-heap: Grow heap (frag case) to 34.448MB for 4285074-byte allocation
03-21 14:12:06.354 29445-29445/com.mylovely.app I/Choreographer: Skipped 41 frames!  The application may be doing too much work on its main thread.
03-21 14:12:06.356 29445-29445/com.mylovely.app I/GraphicBuffer: allocate buffer (w:384 h:384 f:1) handle(0x637baab0) err(0)
03-21 14:12:06.358 29445-29445/com.mylovely.app I/GraphicBuffer: allocate buffer (w:384 h:384 f:1) handle(0x6e7ee640) err(0)
...

我已经做了一些谷歌搜索，发现这似乎已修复 this chromium ticket。但是由于我们无法通过 Google Play 更新 4.4.2 下的系统 webview。除了将其他 webview（如crosswalk）嵌入到应用程序之外，还有其他方法可以修复/解决此问题吗？

Answer 1

我找到了问题的根本原因。我在onProgressChanged 回调中添加了一些繁重的js 任务，它们会输出一个空对象。此空对象无法序列化并导致this chromium ticket 中的错误。作为一种解决方法，我使用 IIFE 包装了所有 js 调用，以使用 Guava 的 RateLimiter 来抑制输出并限制 onProgressChanged 中的 js 调用。